ML24326A338
| ML24326A338 | |
| Person / Time | |
|---|---|
| Site: | 05200050, 99902078 |
| Issue date: | 11/21/2024 |
| From: | NuScale |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML24326A327 | List: |
| References | |
| LO-176070 | |
| Download: ML24326A338 (1) | |
Text
Response to NuScale Topical Report Audit Question Question Number: A-LOCA.LTR-39 Receipt Date: 03/25/2024 Question:
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Response
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TR-124587-P, Revision 0, Extended Passive Cooling and Reactivity Control Methodology, describes the extended passive cooling methodology. In NuScale Power Plants, the ultimate heat sink (UHS) pool water level is required to remain over the top of the decay heat removal system (DHRS) condenser for at least 72 hours, based on conservative hand-calculations. ((
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}}2(a)(c) Natural convection is a function of the temperature difference between the wall and bulk fluid temperature while boiling heat transfer is a function of the temperature difference between wall and bulk fluid saturation temperature.
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(( }}2(a)(c) Therefore, the LOCA EM and the extended passive cooling EM provide conservative approaches to model pool level and temperature in NRELAP5. NuScale Nonproprietary NuScale Nonproprietary
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(( }}2(a)(c) No changes to the SDAA are necessary. NuScale Nonproprietary NuScale Nonproprietary}}